Github user zentol commented on a diff in the pull request: https://github.com/apache/flink/pull/2484#discussion_r80233334 --- Diff: flink-streaming-connectors/flink-connector-cassandra/src/test/java/org/apache/flink/streaming/connectors/cassandra/CassandraConnectorITCase.java --- @@ -178,89 +166,122 @@ public static void startCassandra() throws IOException { } scanner.close(); - - // Tell cassandra where the configuration files are. - // Use the test configuration file. - System.setProperty("cassandra.config", tmp.getAbsoluteFile().toURI().toString()); - if (EMBEDDED) { - cassandra = new EmbeddedCassandraService(); - cassandra.start(); + String javaCommand = getJavaCommandPath(); + + // create a logging file for the process + File tempLogFile = File.createTempFile("testlogconfig", "properties"); + CommonTestUtils.printLog4jDebugConfig(tempLogFile); + + // start the task manager process + String[] command = new String[]{ + javaCommand, + "-Dlog.level=DEBUG", + "-Dlog4j.configuration=file:" + tempLogFile.getAbsolutePath(), + "-Dcassandra.config=" + tmp.toURI(), + // these options were taken directly from the jvm.options file in the cassandra repo + "-XX:+UseThreadPriorities", + "-Xss256k", + "-XX:+AlwaysPreTouch", + "-XX:+UseTLAB", + "-XX:+ResizeTLAB", + "-XX:+UseNUMA", + "-XX:+PerfDisableSharedMem", + "-XX:+UseParNewGC", + "-XX:+UseConcMarkSweepGC", + "-XX:+CMSParallelRemarkEnabled", + "-XX:SurvivorRatio=8", + "-XX:MaxTenuringThreshold=1", + "-XX:CMSInitiatingOccupancyFraction=75", + "-XX:+UseCMSInitiatingOccupancyOnly", + "-XX:CMSWaitDuration=10000", + "-XX:+CMSParallelInitialMarkEnabled", + "-XX:+CMSEdenChunksRecordAlways", + "-XX:+CMSClassUnloadingEnabled", + + "-classpath", getCurrentClasspath(), + EmbeddedCassandraService.class.getName() + }; + + ProcessBuilder bld = new ProcessBuilder(command); + cassandra = bld.start(); + sw = new StringWriter(); + new PipeForwarder(cassandra.getErrorStream(), sw); } - try { - Thread.sleep(1000 * 10); - } catch (InterruptedException e) { //give cassandra a few seconds to start up + int attempt = 0; + while (true) { + try { + attempt++; + cluster = builder.getCluster(); + session = cluster.connect(); + break; + } catch (Exception e) { + if (attempt > 30) { + throw e; + } + try { + Thread.sleep(1000); + } catch (InterruptedException e1) { + } + } } - - cluster = builder.getCluster(); - session = cluster.connect(); + LOG.debug("Connection established after " + attempt + " attempts."); session.execute(CREATE_KEYSPACE_QUERY); - session.execute(CREATE_TABLE_QUERY); - } - - @BeforeClass - public static void startFlink() throws Exception { - Configuration config = new Configuration(); - config.setInteger(ConfigConstants.TASK_MANAGER_NUM_TASK_SLOTS, 4); + session.execute(CREATE_TABLE_QUERY.replace("$TABLE", "flink_initial")); - flinkCluster = new ForkableFlinkMiniCluster(config); - flinkCluster.start(); + try { + Thread.sleep(5000); --- End diff -- the execute() call is synchronous, it's not about making sure that it is complete. I just found that giving Cassandra a bit of time after creating the keyspace and the first table resulted in a higher stability.
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